CVE-2026-34926
CWE-23Published: May 21, 2026· Updated: May 22, 2026
Official Description
A directory traversal vulnerability in the Apex One (on-premise) server could allow a pre-authenticated local attacker to modify a key table on the server to inject malicious code to deploy to agents on affected installations.
This vulnerability is only exploitable on the on-premise version of Apex One and a potential attacker must have access to the Apex One Server and already obtained administrative credentials to the server via some other method to exploit this vulnerability.
Risk Analysis
This medium-severity vulnerability in Trend Micro Apex One (on-premise) server allows a pre-authenticated local attacker to modify a key table and inject malicious code. The flaw is a directory traversal vulnerability that requires administrative credentials to exploit. Despite the medium CVSS score of 6.7, its presence in CISA's KEV catalog indicates confirmed exploitation.
This vulnerability is actively exploited in the wild and is listed in CISA's KEV catalog. Exploitation requires local access and administrative credentials to the Apex One server.
Apply the latest security updates for Trend Micro Apex One (on-premise) server. Ensure that administrative credentials are well-protected and restrict local access to the server.
Technical Analysis
CVE-2026-34926 requires local access, meaning attackers must already have a foothold on the target system.
Exploitation requires high privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 6.7.
The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.
CISA has added CVE-2026-34926 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.
CVSS v3.1 Vector Breakdown
Affected Vendors & Products
Exploit & PoC Resources
Official Patches & Advisories
News & Research Mentioning CVE-2026-34926
CVE-2026-34926 is a directory traversal flaw that can be exploited against the on-premise version of Apex One. The post TrendAI Patches Apex One Zero-Day Exploited in the Wild appeared first on SecurityWeek. [xlite_meta score:56 src:SecurityWeek xlite_fp:3a72250359d8977030b2a5da2e755ccf358761c69cfbb0efc6ed2803a965815c]
CISA has added two new vulnerabilities to its Known Exploited Vulnerabilities (KEV) Catalog, based on evidence of active exploitation. CVE-2025-34291 Langflow Origin Validation Error Vulnerability CVE-2026-34926 Trend Micro Apex One (On-Premise) Directory Traversal Vulnerability These types of vulnerabilities are frequent attack vectors for malicious cyber actors and pose significant risks to the federal enterprise. Binding Operational Directive (BOD) 22-01: Reducing the Significant Risk of Known Exploited Vulnerabilities established the KEV Catalog as a living list of known Common Vulnerabilities and Exposures (CVEs) that carry significant risk to the federal enterprise. BOD 22-01 requires Federal Civilian Executive Branch (FCEB) agencies to remedia [xlite_meta score:51 src:CISA Alerts xlite_fp:ea5fcb6f1d50a73eb2a5c66d0f448f8749f17bbe28deacba2b06169e9501df32]
All References (5)
Quick Facts
Related CVEs (CWE-23)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2026-34926 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
- !CISA KEV: Federal agencies must patch per BOD 22-01 timeline
- !Active exploitation confirmed — treat as P1